Definition
Who found trigonometry?
Hippachus
In a right triangle, the shorter sides
Legs
Sin 30
1/2
Formula shown in anime
Sin²+cos²=1
What is trigonometry
Trigonometry is the branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees.
The longest side (which is the one opposite the right angle) is
hypotenuse
Tan 90
Not defined
Sec²2A
Identity2 : 1 + tan^2A = sec^2A
Meaning of trigonometry
Trigonometry is derived from Greek words trigonon (three angles) and metron ( measure).
Name basic trigonometric ratios
Sin, cos, tan etc
Cot 60
3½/3
cosec^2A
Identity3: 1 + cot^2A = cosec^2A